Why is there always 1.5 gb of "wired" ram on my new MPB (2012)

I recently upgraded (after a faulty computer) my macbook pro to a 2012 model 2.3ghtz core I7 4gm ram 500gb hdd 15 inch, from a 2.5 core 2 duo 4gb ram 500gb hdd late 2010 model. after transfereing my documents, ive noticed there is always (even after restart) 1.5gb of wired ram, leaving me little to play with. The number varies from about 1.4- 1.6gb .  Any suggestions?
Here is a screenshot from an app called memory cleaner, which fails to fix the problem.
ive used about 1/2 my HDD space, and at the time of this screenshot was using 2 tabs of safari, (one being this and the other facebook) and iTunes.
Cheers

Exactly what is the problem you perceive?
About OS X Memory Management and Usage
Using Activity Monitor to read System Memory & determine how much RAM is used
Memory Management in Mac OS X
A detailed look at memory usage in OS X
Understanding top output in the Terminal
The amount of available RAM for applications is the sum of Free RAM and Inactive RAM. This will change as applications are opened and closed or change from active to inactive status. The Swap figure represents an estimate of the total amount of swap space required for VM if used, but does not necessarily indicate the actual size of the existing swap file. If you are really in need of more RAM that would be indicated by how frequently the system uses VM. If you open the Terminal and run the top command at the prompt you will find information reported on Pageins () and Pageouts (). Pageouts () is the important figure. If the value in the parentheses is 0 (zero) then OS X is not making instantaneous use of VM which means you have adequate physical RAM for the system with the applications you have loaded. If the figure in parentheses is running positive and your hard drive is constantly being used (thrashing) then you need more physical RAM.
Adding RAM only makes it possible to run more programs concurrently.  It doesn't speed up the computer nor make games run faster.  What it can do is prevent the system from having to use disk-based VM when it runs out of RAM because you are trying to run too many applications concurrently or using applications that are extremely RAM dependent.  It will improve the performance of applications that run mostly in RAM or when loading programs.

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